ANALYTICAL KEY. 
The calyx and corolla together of either more or less than six parts*.... .... CLASS I 
The calyx and corolla together of 6 parts: 
Stamens 6 or less..............0ccceeeeee cece Sai iadchiaiiaele ie wesee eee CLASS II 
Stamens: 93. o5s. os oy walk cae a oe vateacnein Umbellularia, p. 106, or Briogonum, 105 
Stamens 10; united ‘sepals ..j.s:00.0 6 s..5 55 ce wioe eraenntinindeceieeeiene Leguminose, 38 
Stamens many; caducous sepals 2............ cece cece eee eee Fapaveracee, 20 
Stamens many} sépals:3. .. sss0. sc4c sess cee ces be ees eee eed eee ees Sagittaria, 122 
CLASS I.—EXOGENS OR DICOTYLEDONS. 
Calyx and corolla both present. 
Petalsnot united (free); .c20c<5 2664000505084 a4-00a6 tenes KER eee Division 1 
Petals more or less united (cohering)...... 2.0.0... ee ecee cere eee eens Division 2 
Corolla wanting; calyx often petaloid, sometimes wanting...... .......-+ Division 3 
DIVISION I.—POLYPETALA. 
A. Stamens more than 10 and more than double the number of 
petals. 
1. HYPOGYNOUS, i. c., on the receptacle (not adhering to the sepals or petals), 
* Pistils few to many distinct carpels, rarely one. 
Calyx deciduous, sepale: Os ys esaceeeve testes oes see sedeueeener Ranunculacez, 16 
Calyx caducous, sepals 2 or 3....... 2.6005 cece eect eee cere neces Papaveracez, 20 
Calyx persistent, sepals 3 or 4; aquatic plants...... ............. Nymphzacee, 20 
Calyx persistent; leaves all radical...... 22.2.2 202+ reece cece ween eee Rosacez, 49 
Calyx petaloid; corolla wanting............c+esesee eee eeeereeee Ranunculacez, 16 
* * Pistil one and compound, as shown by two or more stigmas, or more than one cell in the 
ovary. 
Petals more numerous than the sepals. 
Indefinitely numerous, slender, persistent; aquatic plants..... Nymphzeacee, 20 
Just twice as many (4-6); sepals caducous................-..- Papaveracez, 20 
Five to sixteen; sepals persistent; fleshy herbs...... ........ Portulacacer, 29 
© Maianthemum (see p. 115) has a» 4-parted perianth; 4 stamens and 2 or 3 parallel-veined leavea, 
